cup of tea with lots of salt
This was something provided to a stoned mate whilst I was out of the room as a joke.

I came back in the room to find something odd going on. Seb, the victim, was standing looking mildly puzzled in the middle of the room (I suspect he is autistic. no one can be so clever and talented and retarded and clumsy at the same time)

He passed me his mug and said "does this taste salty?".

cue the gestures and looks from the pranksters behind him.

I took a swig of the most revoltingly salty mug of tea that ever was, and somehow managing to keep a straight face replied that it was fine.